Chemistry sig figs

[lisafaustina]

i forgot all the sig fig rules from unit 3... can somebody give me a rundown again?

also are temperature, voltage, amps, time and such relevant? cos sometimes the temperature might say 8.0 C and i dont know if thats a significant figure.

[physics]

sig figs
basically
you follow the sig figs of the least accurate result .
so in a Q ppl might say 0.098mol and 0.6940583094M
you follow the one with the least accurate results which is the 0.098 which is 3 sigfigs
and thats basically all of it i think
(someone can clarify?)
and a 0.0980 is 4 sigfigs

[_henwee]

sig figs
basically
you follow the sig figs of the least accurate result .
so in a Q ppl might say 0.098mol and 0.6940583094M
you follow the one with the least accurate results which is the 0.098 which is 3 sigfigs
and thats basically all of it i think
(someone can clarify?)
and a 0.0980 is 4 sigfigs

lol... I thought 0.098 was 2 sig figs and 0.0980 was 3 sig figs.

[TrueTears]

sig figs
basically
you follow the sig figs of the least accurate result .
so in a Q ppl might say 0.098mol and 0.6940583094M
you follow the one with the least accurate results which is the 0.098 which is 3 sigfigs
and thats basically all of it i think
(someone can clarify?)
and a 0.0980 is 4 sigfigs

lol... I thought 0.098 was 2 sig figs and 0.0980 was 3 sig figs.

you're right

[_henwee]

Awesome...

In general:
All zeros before the first non-zero digit is insignificant. eg. 0.000003454 has 4 sig figs.
All digits after (and including) the first non-zero digit is significant. eg. 0.000000580700 has 6 sig figs - do not forget the zero's at the end.
When multiply/dividing... take the least number of sig figs.
When adding/subtracting... take the least number of DECIMAL PLACES.
Any counting numbers do not contribute to significant numbers - eg. 7 types of chemicals.

Hope it helps. =]

[Studyinghard]

so then 7.045 is 4 sig figs?

[kenhung123]

What are some measurements that are insignificant for sig figs?

[lisafaustina]

yay thank u

[jasoN-]

If we had, say, a question with multiple parts comprising of calculations do we use the rounded (to sig figs) answers when we continue?
eg. If values were to 3 sig figs:
a) 5.671233=5.67
b) 5.671233/2 or 5.67/2 <- pure example
c) etc etc.

[toshibaj]

If we had, say, a question with multiple parts comprising of calculations do we use the rounded (to sig figs) answers when we continue?
eg. If values were to 3 sig figs:
a) 5.671233=5.67
b) 5.671233/2 or 5.67/2 <- pure example
c) etc etc.

For a, you definitely have to answer to the appropriate number of significant figures.
For b, I think you can do both ways, but I prefer to do the first, and then round of to sig figs again.

[jasoN-]

Ok yeah that's what I thought. It's similar for math-related subjects, you wouldn't use a rounded answer for a subsequent question

[kenhung123]

Just to let you know I noticed in VCAA there is 2 things they do with sig figs:
1. They tend to be specific to the question e.g. sig fig to 1a) can be different to 1c)
2. Temperature is insignificant